Table 5. Background compatibility between cultivars and mildew isolates.

mildew isolate	Golden Promise	Diamant	SM4142	HL70-8	Apex	Chalice	Riviera	Chariot	Landlord
PV 1	+	+	+	+	+	-	-	-	-
PV 3	+	+	+	+	+	+	+	+	+
PV 4	+	+	+	+	+	+	+	+	-
PV 26	+	+	+	+	+	+	+	+	+
PV 32	+	+	+	+	+	+	+	+	-
PV 41	+	+	+	+	+	+	+	+	-
PV 42	+	+	+	+	+	+	+	+	+
PV 43	+	+	+	+	+	+	+	+	+
PV 44	+	+	+	+	+	+	+	+	+
CC/1	+	+	+	+	-	?	?	?	-